<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app"></div>
  
    <script src="./js/vue.js"></script>
    <script>
      const app = Vue.createApp({
        template: `<h2>你好啊, Vue3</h2>`
      });
  
      app.mount('#app');
    </script>
</body>
</html>